<template>
	<view class="content" style="display: flex;flex-direction: column;">
		<!-- #ifdef MP-WEIXIN -->
		<view style="width: 100%;position: fixed;top: 0;z-index: 99;background: #FFFFFF;" :style="{'height':statusBarHeight+'px' }"></view>
		<view class="getPosition" style="height: 90upx;position: fixed;z-index: 99;width: 100%" :style="{'top':statusBarHeight+'px' }">
			<text>分类</text>
		</view>
		<view class="" @click="search()" style="background: #FFFFFF;height: 80upx;display: flex;justify-content: center;align-items: center;"
		 :style="[{'margin-top': statusBarHeight+45+'px'}]">
			<input class="" type="text" value="" placeholder="输入关键字搜索" style="font-size: 28upx;background: #F5F5F5;height: 60upx;width: 90%;border-radius: 50upx;text-align: center;" />
		</view>
		<!-- 占位 -->
		<!-- <view class="" :style="[{'height': statusBarHeight+45+'px'}]"></view> -->
		<!-- #endif -->

		<view class="" :style="{height: height + 'px'}" style="display: flex;flex-direction: row;">
			<scroll-view scroll-y class="left-aside">
				<!-- 一级分类 -->
				<view v-for="item in flist" :key="item.id" class="f-item b-b" :class="{ active: item.id === currentId }" @click="tabtap(item)">{{ item.name }}</view>
			</scroll-view>
			<scroll-view scroll-with-animation scroll-y class="right-aside" @scroll="asideScroll" :scroll-top="tabScrollTop">
				<view v-for="item in slist" :key="item.id" class="s-list" :id="'main-' + item.id">
					<text class="s-item" @click="navToList(item.id)">{{ item.name }}</text>
					<view class="t-list">
						<view @click="navToDetailPage(titem)" v-if="titem.pid === item.id" class="t-item" v-for="titem in tlist" :key="titem.id">
							<image :src="titem.pic"></image>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import mallplusCopyright from '@/components/mall-copyright/mallplusCopyright.vue';
	import Api from '@/common/api';
	export default {
		components: {
			mallplusCopyright
		},
		data() {
			return {
				sizeCalcState: false,
				tabScrollTop: 0,
				currentId: 1,
				flist: [],
				slist: [],
				tlist: [],

				height: '',
				statusBarHeight: '',
			};
		},
		onLoad() {
			this.statusBarHeight = uni.getSystemInfoSync().statusBarHeight
			this.height = uni.getSystemInfoSync().windowHeight - (this.statusBarHeight + 80)

			this.loadData();
		},
		methods: {
			async loadData() {

				let list = this.$db.get('categoryList')
				if (!list) {
					let params = {};
					list = await Api.apiCall('get', Api.goods.typeGoodsList, params);
					this.$db.set('categoryList', list)
				}

				if (list) {
					list.forEach(item => {

						if (item.level == 0) {
							this.flist.push(item); //pid为父级id, 没有pid或者pid=0是一级分类
						} else if (item.level == 1) {
							this.slist.push(item); //没有价格的是2级分类
						} else {
							this.tlist.push(item); //3级分类
						}
					});
				}
			},
			//一级分类点击
			tabtap(item) {
				if (!this.sizeCalcState) {
					this.calcSize();
				}
				this.currentId = item.id;
				let index = this.slist.findIndex(sitem => sitem.pid === item.id);
				if (index >= 0) {
					this.tabScrollTop = this.slist[index].top;
				}
			},
			//右侧栏滚动
			asideScroll(e) {
				if (!this.sizeCalcState) {
					this.calcSize();
				}
				let scrollTop = e.detail.scrollTop;
				let tabs = this.slist.filter(item => item.top <= scrollTop).reverse();
				if (tabs.length > 0) {
					this.currentId = tabs[0].pid;
				}
			},
			//计算右侧栏每个tab的高度等信息
			calcSize() {
				let h = 0;
				this.slist.forEach(item => {
					let view = uni.createSelectorQuery().select('#main-' + item.id);
					view.fields({
							size: true
						},
						data => {
							item.top = h;
							h += data.height;
							item.bottom = h;
						}
					).exec();
				});
				this.sizeCalcState = true;
			},
			navToList(sid) {
				uni.navigateTo({
					url: `../../pagesA/product/list?sid=${sid}`
				});
			},
			//详情页
			navToDetailPage(item) {
				//测试数据没有写id，用title代替
				let id = item.id;
				uni.navigateTo({
					url: `../../pagesA/product/product?id=${id}`
				});
			},
		}
	};
</script>

<style lang="scss">
	page,
	.content {
		height: 100%;
		background-color: #f8f8f8;
	}

	.content {
		display: flex;
	}

	.left-aside {
		flex-shrink: 0;
		width: 200upx;
		height: 100%;
		background-color: #fff;
	}

	.f-item {
		display: flex;
		align-items: center;
		justify-content: center;
		width: 100%;
		height: 100upx;
		font-size: 28upx;
		color: $font-color-base;
		position: relative;

		&.active {
			color: $base-color;
			background: #f8f8f8;

			&:before {
				content: '';
				position: absolute;
				left: 0;
				top: 50%;
				transform: translateY(-50%);
				height: 36upx;
				width: 8upx;
				background-color: $base-color;
				border-radius: 0 4px 4px 0;
				opacity: 0.8;
			}
		}
	}

	.right-aside {
		flex: 1;
		overflow: hidden;
		padding-left: 20upx;
	}

	.s-item {
		display: flex;
		align-items: center;
		height: 70upx;
		padding-top: 8upx;
		font-size: 28upx;
		color: $font-color-dark;
	}

	.t-list {
		display: flex;
		flex-wrap: wrap;
		width: 100%;
		background: #fff;
		padding-top: 12upx;

		&:after {
			content: '';
			flex: 99;
			height: 0;
		}
	}

	.t-item {
		flex-shrink: 0;
		display: flex;
		justify-content: center;
		align-items: center;
		flex-direction: column;
		width: 176upx;
		font-size: 26upx;
		color: #666;
		padding-bottom: 20upx;

		image {
			width: 140upx;
			height: 140upx;
		}
	}

	.getPosition {
		height: 100upx;
		display: flex;
		justify-content: center;
		align-items: center;
		font-size: 32upx;
		background-color: #FFF;
	}
</style>
